I finally understood the reason why my mum had encouraged me not to give up.
这个句子里的why是引导定语从句吗?可以换成for which 吗?
I finally understood the reason why my mum had encouraged me not to give up.
=I finally understood the reason for which my mum had encouraged me not to give up.
备注:第1句引导定语从句的关系副词why可以改为第2句的介词for+关系代词which引导定语从句
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